The Pleistocene biochronology of Ukraine based on remains of small mammals was established in the late 20th century. The main biochronological criteria used at that time were based on temporal changes in the fauna composition and percentage differences between teeth morphotypes in voles (Arvicolidae). In the present paper, these criteria are supplemented by morphometric data of the occlusal surface and enamel thickness of the first lower molars. The obtained numerical indices allowed evolutionary changes for particular taxa within Arvicolidae during the Pleistocene to be established. Evolutionary changes within particular lineages (Allophaiomys-Microtus s.l., Mimomys-Arvicola, Borsodia-Prolagurus-Lagurus) are discussed. The chronological sequence of about 70 Pleistocene sites in Ukraine and adjacent countries was described based on using both old and new criteria and taking into account cyclic climatic changes. We use and update biochronological units, i.e. faunal assemblages (formerly faunal complexes), which are divided into several associations (composition of arvicolid taxa at a particular evolutionary level in reference faunas). Further correlation of Pleistocene deposits is also possible since some marine sediments in the territory of Ukraine contain arvicolid remains.

中文翻译：

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过去 180 万年乌克兰小型哺乳动物群的最新生物年代学基于田鼠（啮齿类动物，Arvicolidae）：综述

基于小型哺乳动物遗骸的乌克兰更新世生物年代学建立于 20 世纪后期。当时使用的主要生物年代学标准是基于动物群组成的时间变化和田鼠（Arvicolidae）牙齿形态类型之间的百分比差异。在本文中，这些标准由咬合面的形态测量数据和第一下磨牙的牙釉质厚度补充。获得的数值指数允许确定更新世期间 Arvicolidae 内特定分类群的进化变化。特定谱系内的进化变化（Allophaiomys - Microtus sl、Mimomys - Arvicola、Borsodia-Prolagurus -拉古鲁斯）进行了讨论。乌克兰和邻近国家约 70 个更新世遗址的年代顺序是基于使用新旧标准并考虑到周期性气候变化来描述的。我们使用和更新生物年代学单位，即动物群组合（以前的动物群），它们被分为几个关联（参考动物群中特定进化水平的亚维科利德分类群的组成）。更新世沉积物的进一步关联也是可能的，因为乌克兰境内的一些海洋沉积物含有石蜡虫遗骸。